XS Big Dot sight allows for enhanced sight acquisition in all light conditions. The front sight features a Tritium dot outlined by a white line which enhances use in daylight. A great upgrade from factory sights.
Please note this model is for fixed-sight J-Frame Smith & Wesson revolvers, such as the 637 and 642. It requires significant file or mill work to the existing front sight, and is epoxied in place. Gunsmith installation is highly recommended.